curcur commented on a change in pull request #14943:
URL: https://github.com/apache/flink/pull/14943#discussion_r583686130
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/state/StateBackendLoader.java
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@@ -204,6 +222,11 @@ public static StateBackend
fromApplicationOrConfigOrDefault(
// (1) the application defined state backend has precedence
if (fromApplication != null) {
+
+ checkArgument(
+ !(fromApplication instanceof DelegateStateBackend),
+ "DelegateStateBackend can not be delegated!");
Review comment:
When I said `why not`, I was thinking of why does `deserialization`
matters here? Why it can not be deserialized.
If you mean the read config deserialization in JM or TM, it does not matter
because we do not allow `changelogstatebackend` from the application. Even if
we do, that should not be a problem as well, because DelegateStateBackend is a
StateBackend which is `java.io.Serializable`. At least from all ITTests, I ran
so far, I did not see that type of problem.
Or do you mean something else?
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